pass byte in servlets

[muntago Richard]

i need to pass image as bytes in servlet request parameter
i have set the setters and getters as byte

assuming i have

String picture = request.getParameter("picture");

how do i code it as byte and pass it in servlet. Is it like this

byte[] picture = null;

[Richard Tookey]

Raw binary data cannot be passed in a parameter. The normal way of handling this is to first encode (Base64 or Hex say) the binary data before sending it as a parameter and then to decode it in the Servlet. BUT - since the data seems to be an image and is likely to be longer than can be sent as a parameter you should consider sending it as the body of a POST then no encoding is required.

[muntago Richard]

This is my getters and setters in a java class. how do i pass it to servlet request parameter

private byte[] picture;
 

  public Applicant() {}
  
  public Applicant(byte[] picture) {
  this.picture = picture;
  
  }
  
  public byte[] getPicture() {
  return picture;
  }
  public void setPicture(byte[] picture) {
  this.picture = picture;
  }
  

[Bear Bibeault]

What's doing the passing? As already pointed out, you'll need to encode it in BASE64, set all the right headers, and pass it as the POST body of a multipart request with appropriate separators.

If it's being sent from a browser, a multi-part form and file input element will do this automatically. Otherwise, you'll need to find out all about the necessary format. There may be support for such things in 3rd party libraries such as HttpClient, but I'm not sure.

[muntago Richard]

i tried to upload image as byte into database from servlets ,it works excellent

as follows

 
BufferedImage originalImage = 
                              ImageIO.read(new File("C:\\Tomcat 7.0\\webapps\\moha.jpg"));
 
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	ImageIO.write( originalImage, "jpg", baos );
	byte[] picture = baos.toByteArray();
	baos.close();

okay now i wants to upload it to database via form input elements

so i code it this way

 
BufferedImage originalImage = 
                              ImageIO.read(new File(picture));
 
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	ImageIO.write( originalImage, "jpg", baos );
	byte[] picture = baos.toByteArray();
	baos.close();

when i run it, it displays error variable picture not found. if try this

  String picture = request.getParameter("picture");

it displays error picture is already define
any help